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Movement Ecology

D K Briscoe, D M Parker, S Bograd, E Hazen, K Scales, G H Balazs, M Kurita, T Saito, H Okamoto, M Rice, J J Polovina, L B Crowder
BACKGROUND: The juvenile stage of loggerhead sea turtles (Caretta caretta) can last for decades. In the North Pacific Ocean, much is known about their seasonal movements in relation to pelagic habitat, yet understanding their multi-year, basin-scale movements has proven more difficult. Here, we categorize the large-scale movements of 231 turtles satellite tracked from 1997 to 2013 and explore the influence of biological and environmental drivers on basin-scale movement. RESULTS: Results show high residency of juvenile loggerheads within the Central North Pacific and a moderate influence of the Earth's magnetic field, but no real-time environmental driver to explain migratory behavior...
2016: Movement Ecology
Rory P Wilson, Mark D Holton, James S Walker, Emily L C Shepard, D Mike Scantlebury, Vianney L Wilson, Gwendoline I Wilson, Brenda Tysse, Mike Gravenor, Javier Ciancio, Melitta A McNarry, Kelly A Mackintosh, Lama Qasem, Frank Rosell, Patricia M Graf, Flavio Quintana, Agustina Gomez-Laich, Juan-Emilio Sala, Christina C Mulvenna, Nicola J Marks, Mark W Jones
BACKGROUND: We are increasingly using recording devices with multiple sensors operating at high frequencies to produce large volumes of data which are problematic to interpret. A particularly challenging example comes from studies on animals and humans where researchers use animal-attached accelerometers on moving subjects to attempt to quantify behaviour, energy expenditure and condition. RESULTS: The approach taken effectively concatinated three complex lines of acceleration into one visualization that highlighted patterns that were otherwise not obvious...
2016: Movement Ecology
Hendrik Edelhoff, Johannes Signer, Niko Balkenhol
Increased availability of high-resolution movement data has led to the development of numerous methods for studying changes in animal movement behavior. Path segmentation methods provide basics for detecting movement changes and the behavioral mechanisms driving them. However, available path segmentation methods differ vastly with respect to underlying statistical assumptions and output produced. Consequently, it is currently difficult for researchers new to path segmentation to gain an overview of the different methods, and choose one that is appropriate for their data and research questions...
2016: Movement Ecology
Ivan Maggini, Benjamin Metzger, Maren Voss, Christian C Voigt, Franz Bairlein
BACKGROUND: Describing migratory connectivity in mobile animals is crucial for understanding the selective pressures acting on different populations throughout their life cycle. Tracking single individuals has provided valuable data, but for most species the data available are still spurious and usually limited to a few individuals. Since different populations of migratory birds can be distinguished by a combination of morphometric measurements and the isotopic composition of their feathers, it is possible to measure these parameters on a large sample to differentiate populations...
2016: Movement Ecology
Guillaume Péron, Chris H Fleming, Rogerio C de Paula, Justin M Calabrese
BACKGROUND: Periodicity in activity level (rest/activity cycles) is ubiquitous in nature, but whether and how these periodicities translate into periodic patterns of space use by animals is much less documented. Here we introduce an analytical protocol based on the Lomb-Scargle periodogram (LSP) to facilitate exploration of animal tracking datasets for periodic patterns. The LSP accommodates missing observations and variation in the sampling intervals of the location time series. RESULTS: We describe a new, fast algorithm to compute the LSP...
2016: Movement Ecology
Andrew Berdahl, Anieke van Leeuwen, Simon A Levin, Colin J Torney
BACKGROUND: Mass migrations are among the most striking examples of animal movement in the natural world. Such migrations are major drivers of ecosystem processes and strongly influence the survival and fecundity of individuals. For migratory animals, a formidable challenge is to find their way over long distances and through complex, dynamic environments. However, recent theoretical and empirical work suggests that by traveling in groups, individuals are able to overcome these challenges and increase their ability to navigate...
2016: Movement Ecology
Andrew M Kittle, John K Bukombe, Anthony R E Sinclair, Simon A R Mduma, John M Fryxell
BACKGROUND: Where apex predators move on the landscape influences ecosystem structure and function and is therefore key to effective landscape-level management and species-specific conservation. However the factors underlying predator distribution patterns within functional ecosystems are poorly understood. Predator movement should be sensitive to the spatial patterns of inter-specific competitors, spatial variation in prey density, and landscape attributes that increase individual prey vulnerability...
2016: Movement Ecology
Franz Bairlein, D Ryan Norris, Christian C Voigt, Erica H Dunn, David J T Hussell
BACKGROUND: Knowledge of immigration and emigration rates is crucial for understanding of population dynamics, yet little is known about these vital rates, especially for arctic songbirds. We estimated immigration in an Arctic population of northern wheatears on Baffin Island, Canada, by the use of stable hydrogen isotopes in tail feathers (δ(2)HK). We assumed that δ(2)HK values of juvenile (hatch-year) feathers grown at the breeding grounds were representative of the local population, while those of breeding adults were indicative of where they grew their feathers during their post-breeding molt the previous year...
2016: Movement Ecology
Guillaume Bastille-Rousseau, Jonathan R Potts, Charles B Yackulic, Jacqueline L Frair, E Hance Ellington, Stephen Blake
BACKGROUND: Characterizing the movement patterns of animals is an important step in understanding their ecology. Various methods have been developed for classifying animal movement at both coarse (e.g., migratory vs. sedentary behavior) and fine (e.g., resting vs. foraging) scales. A popular approach for classifying movements at coarse resolutions involves fitting time series of net-squared displacement (NSD) to models representing different conceptualizations of coarse movement strategies (i...
2016: Movement Ecology
Natalie Isaksson, Thomas J Evans, Judy Shamoun-Baranes, Susanne Åkesson
BACKGROUND: Generalist predators may vary their diet and use of habitat according to both internal state (e.g. breeding stage) and external (e.g. weather) factors. Lesser black-backed gulls Larus fuscus (Linnaeus 1758) are dietary generalists, foraging in both terrestrial and marine habitats during breeding. We investigate what affects the gulls' propensity to forage at sea or on land. We assess the importance of terrestrial foraging to gulls in the Baltic Sea (sub. sp. L. f. fuscus), looking especially at their use of agricultural fields...
2016: Movement Ecology
Emily L Weiser, Richard B Lanctot, Stephen C Brown, José A Alves, Phil F Battley, Rebecca Bentzen, Joël Bêty, Mary Anne Bishop, Megan Boldenow, Loïc Bollache, Bruce Casler, Maureen Christie, Jonathan T Coleman, Jesse R Conklin, Willow B English, H River Gates, Olivier Gilg, Marie-Andrée Giroux, Ken Gosbell, Chris Hassell, Jim Helmericks, Andrew Johnson, Borgný Katrínardóttir, Kari Koivula, Eunbi Kwon, Jean-Francois Lamarre, Johannes Lang, David B Lank, Nicolas Lecomte, Joe Liebezeit, Vanessa Loverti, Laura McKinnon, Clive Minton, David Mizrahi, Erica Nol, Veli-Matti Pakanen, Johanna Perz, Ron Porter, Jennie Rausch, Jeroen Reneerkens, Nelli Rönkä, Sarah Saalfeld, Nathan Senner, Benoît Sittler, Paul A Smith, Kristine Sowl, Audrey Taylor, David H Ward, Stephen Yezerinac, Brett K Sandercock
BACKGROUND: Geolocators are useful for tracking movements of long-distance migrants, but potential negative effects on birds have not been well studied. We tested for effects of geolocators (0.8-2.0 g total, representing 0.1-3.9 % of mean body mass) on 16 species of migratory shorebirds, including five species with 2-4 subspecies each for a total of 23 study taxa. Study species spanned a range of body sizes (26-1091 g) and eight genera, and were tagged at 23 breeding and eight nonbreeding sites...
2016: Movement Ecology
Craig R Ely, Brandt W Meixell
BACKGROUND: Migration is a prominent aspect of the life history of many avian species, but the demographic consequences of variable migration strategies have only infrequently been investigated, and rarely when using modern technological and analytical methods for assessing survival, movement patterns, and long-term productivity in the context of life history theory. We monitored the fates of 50 satellite-implanted tundra swans (Cygnus columbianus) over 4 years from five disparate breeding areas in Alaska, and used known-fate analyses to estimate monthly survival probability relative to migration distance, breeding area, migratory flyway, breeding status, and age...
2016: Movement Ecology
Mathieu Leblond, Martin-Hugues St-Laurent, Steeve D Côté
BACKGROUND: Freshwater lakes and rivers of the Northern Hemisphere have been freezing increasingly later and thawing increasingly earlier during the last century. With reduced temporal periods during which ice conditions are favourable for locomotion, freshwater bodies could become impediments to the inter-patch movements, dispersion, or migration of terrestrial animals that use ice-covered lakes and rivers to move across their range. Studying the fine-scale responses of individuals to broad-scale changes in ice availability and phenology would help to understand how animals react to ongoing climate change, and contribute to the conservation and management of endangered species living in northern environments...
2016: Movement Ecology
Sanna Mäkeläinen, Henrik J de Knegt, Otso Ovaskainen, Ilpo K Hanski
[This corrects the article DOI: 10.1186/s40462-016-0071-z.].
2016: Movement Ecology
Markus Kautz, Muhammad Ali Imron, Kai Dworschak, Reinhard Schopf
BACKGROUND: Dispersal is a key process in the response of insect populations to rapidly changing environmental conditions. Variability among individuals, regarding the timing of dispersal initiation and travelled distance from source, is assumed to contribute to increased population success through risk spreading. However, experiments are often limited in studying complex dispersal interactions over space and time. By applying a local-scaled individual-based simulation model we studied dispersal and emerging infestation patterns in a host - bark beetle system (Picea abies - Ips typgraphus)...
2016: Movement Ecology
Dominic A W Henry, Judith M Ament, Graeme S Cumming
BACKGROUND: The movement patterns of many southern African waterfowl are typified by nomadism, which is thought to be a response to unpredictable changes in resource distributions. Nomadism and the related movement choices that waterfowl make in arid environments are, however, poorly understood. Tracking multiple individuals across wide spatiotemporal gradients offers one approach to elucidating the cues and mechanisms underpinning movement decisions. We used first-passage time (FPT) to analyse high spatial and temporal resolution telemetry data for Red-billed Teal and Egyptian Geese across a 1500 km geographical gradient between 2008 and 2014...
2016: Movement Ecology
Nathalie I Gilbert, Ricardo A Correia, João Paulo Silva, Carlos Pacheco, Inês Catry, Philip W Atkinson, Jenny A Gill, Aldina M A Franco
BACKGROUND: The migratory patterns of animals are changing in response to global environmental change with many species forming resident populations in areas where they were once migratory. The white stork (Ciconia ciconia) was wholly migratory in Europe but recently guaranteed, year-round food from landfill sites has facilitated the establishment of resident populations in Iberia. In this study 17 resident white storks were fitted with GPS/GSM data loggers (including accelerometer) and tracked for 9...
2016: Movement Ecology
Daniel H Catlin, Sara L Zeigler, Mary Bomberger Brown, Lauren R Dinan, James D Fraser, Kelsi L Hunt, Joel G Jorgensen
BACKGROUND: Many species are distributed as metapopulations in dynamic landscapes, where habitats change through space and time. Individuals locate habitat through dispersal, and the relationship between a species and landscape characteristics can have profound effects on population persistence. Despite the importance of connectivity in dynamic environments, few empirical studies have examined temporal variability in dispersal or its effect on metapopulation dynamics. In response to this knowledge gap, we studied the dispersal, demography, and viability of a metapopulation of an endangered, disturbance-dependent shorebird...
2016: Movement Ecology
Sanna Mäkeläinen, Henrik J de Knegt, Otso Ovaskainen, Ilpo K Hanski
BACKGROUND: Urbanization causes modification, fragmentation and loss of native habitats. Such landscape changes threaten many arboreal and gliding mammals by limiting their movements through treeless parts of a landscape and by making the landscape surrounding suitable habitat patches more inhospitable. Here, we investigate the effects of landscape structure and habitat availability on the home-range use and movement patterns of the Siberian flying squirrel (Pteromys volans) at different spatial and temporal scales...
2016: Movement Ecology
John Boss, Miriam Liedvogel, Max Lundberg, Peter Olsson, Nils Reischke, Sara Naurin, Susanne Åkesson, Dennis Hasselquist, Anthony Wright, Mats Grahn, Staffan Bensch
BACKGROUND: We still have limited knowledge about the underlying genetic mechanisms that enable migrating species of birds to navigate the globe. Here we make an attempt to get insight into the genetic architecture controlling this complex innate behaviour. We contrast the gene expression profiles of two closely related songbird subspecies with divergent migratory phenotypes. In addition to comparing differences in migratory strategy we include a temporal component and contrast patterns between breeding adults and autumn migrating juvenile birds of both subspecies...
2016: Movement Ecology
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